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Powering ATX Motherboard on 12V Battery

Last response: in Motherboards
July 14, 2010 2:30:50 PM

Hello everyone,

I need to run an old ATX motherboard on 12V DC batteries instead of the powersupply. I need that for a robotics project.
I know that power supply provides +12V, -12V, +5V, & -5V DC to the motherboard and other components, but I'm little confused about the +12 and -12 issue, I mean can these be directly connected to the +ve and -ve output of the 12V battery??

My question in simple words: How can I run motherboard on 12V battery?
a c 156 V Motherboard
July 15, 2010 1:13:03 PM

The voltage difference between +12 volts and -12 volts is 24 volts. You may not need the -12 volts for the motherboard. But you probably do need 3.3 volts (the orange wires) to power the memory.

The only way I see is to cobble together 5 and 3.3 volt regulators fed from the battery. They should be switching regulators for better efficiency.